Which of the following natural features of a landscape do cities in the developed world modify most often?

Glaciers are massive, slow-moving bodies of ice that primarily shape landscapes over geological time scales. While they can influence landforms, the direct modification of glaciers by cities is rare due to their remote locations and the environmental protections typically surrounding them. Urban development does not commonly interact with glaciers as it does with rivers.

Mountains are typically less modified than rivers because of their rugged terrain and the complexities involved in altering such large landforms. Urban development may occur at the base of mountains, but significant modification is less common compared to rivers, where more direct urban activities can take place.

While plateaus can be sites for urban development, they are generally stable landforms that do not require extensive modification. Cities often build on plateaus rather than altering their structure significantly, making them less frequently modified compared to rivers.